Information Relating to the Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net decrease (increase) in operating working capital
Decrease in accounts and notes receivable	$ 296	$ 145
Increase in inventories	(611)	(835)
Decrease (increase) in prepaid expenses and other current assets	775	(184)
(Decrease) increase in accounts payable and accrued liabilities	(1,894)	347
Decrease in income and other taxes payable	(591)	(214)
Net increase in operating working capital	(2,025)	(741)
Cash Payment for Interest on Debt and For Income Taxes
Income taxes	3,404	6,026
Net (purchases) sales of time deposits
Time deposits purchased	0	(308)
Time deposits matured	8	308
Net (purchases) sales of time deposits	8	0
Net sales of marketable securities
Marketable securities purchased	0	(4)
Marketable securities sold	64	4
Net sales of marketable securities	64	0
Capital expenditures
Additions to properties, plant and equipment	14,599	17,019
Additions to investments	275	221
Current year dry hole expenditures	371	251
Payments for other liabilities and assets, net	0	(16)
Capital expenditures	15,245	17,475
Expensed exploration expenditures	507	614
Assets acquired through capital lease obligations	29	10
Capital and exploratory expenditures, excluding equity affiliates	15,781	18,099
Company's share of expenditures by equity affiliates	1,526	1,517
Capital and exploratory expenditures, including equity affiliates	$ 17,307	$ 19,616